Taxes does not create new money. Taxation is the returning of distributed money back to the distributor for the purpose of redistribution. If the money is not returned then the distributor is forced to create new money which in turn causes inflation lessening the value of the currency.
Who's saying otherwise?
You are making the assumption that taxation creates or otherwise determines the value of money (or fiat currency if you want to keep using that term, it's basically the same thing).
Unless....you don't know what the term "fiat" means. Which, going by your argument, you don't. But that's another topic at hand.
You are attributing a collection process to value. That is absolutely false. Taxation can and has remain constant, while value of the money itself has changed, changes daily, and changes in either direction without any help of the government and/or it's taxing policies.
So when you want to pretend that taxes aren't tied into the value of fiat currencies and present the argument of it causing hyper inflation. You simply have it backwards.
That is not my argument at all. Stop creating strawmans to argue with.